Regrowing Farm Crops : Wormwood Crash

[00:04:32]: [string "../mods/workshop-1854726253/modmain.lua"]:67: attempt to index field 'grower' (a nil value)
LUA ERROR stack traceback:
    ../mods/workshop-1854726253/modmain.lua:67 in (method) Harvest (Lua) <66-84>
    scripts/actions.lua:1241 in (field) fn (Lua) <1239-1258>
    scripts/bufferedaction.lua:25 in (method) Do (Lua) <21-35>
    scripts/entityscript.lua:1313 in (method) PerformBufferedAction (Lua) <1305-1323>
    scripts/stategraphs/SGwilson.lua:4317 in (field) ontimeout (Lua) <4310-4318>
    scripts/stategraph.lua:556 in (method) UpdateState (Lua) <542-586>
    scripts/stategraph.lua:613 in (method) Update (Lua) <605-633>
    scripts/stategraph.lua:128 in (method) Update (Lua) <109-153>
    scripts/update.lua:228 in () ? (Lua) <159-238>